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[ASUS_ACPI] work around Samsung P30s oops

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The code used to rely on a certain method to return a NULL buffer, which
is now hardly possible with the implicit return code on by default. This
sort of fixes bugs #5067 and #5092 for now.

Note: this patch makes the driver unusable on said machines (and on said
machines only) iff acpi=strict is specified, but it seems noone really uses
that.

Signed-off-by: Karol Kozimor <sziwan@hell.org.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Karol Kozimor 2005-12-22 12:42:00 -05:00 committed by Len Brown
parent 3603bc8dc5
commit b697b5372e
1 changed files with 18 additions and 9 deletions
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27
drivers/acpi/asus_acpi.c
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@ -987,9 +987,21 @@ static int __init asus_hotk_get_info(void)
printk(KERN_NOTICE " BSTS called, 0x%02x returned\n",
bsts_result);
/* Samsung P30 has a device with a valid _HID whose INIT does not
* return anything. Catch this one and any similar here */
if (buffer.pointer == NULL) {
/* This is unlikely with implicit return */
if (buffer.pointer == NULL)
return -EINVAL;
model = (union acpi_object *) buffer.pointer;
/*
* Samsung P30 has a device with a valid _HID whose INIT does not
* return anything. It used to be possible to catch this exception,
* but the implicit return code will now happily confuse the
* driver. We assume that every ACPI_TYPE_STRING is a valid model
* identifier but it's still possible to get completely bogus data.
*/
if (model->type == ACPI_TYPE_STRING) {
printk(KERN_NOTICE " %s model detected, ", model->string.pointer);
} else {
if (asus_info && /* Samsung P30 */
strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) {
hotk->model = P30;
@ -1002,13 +1014,10 @@ static int __init asus_hotk_get_info(void)
"the developers with your DSDT\n");
}
hotk->methods = &model_conf[hotk->model];
return AE_OK;
}
acpi_os_free(model);
model = (union acpi_object *)buffer.pointer;
if (model->type == ACPI_TYPE_STRING) {
printk(KERN_NOTICE " %s model detected, ",
model->string.pointer);
return AE_OK;
}
hotk->model = END_MODEL;